I just downloaded Kenny Studio NXT (the new prototype that you just released) on my Macbook Pro, and the first major issue was immediately apparent: I can't delete anything! Presumably the Del key the app responds to is a different key from the 'delete' on this keyboard, since this is a shorter keyboard that doesn't have the numpad and stuff. I think full size keyboards actually have multiple keys for deleting (Backspace, Del, etc.) so you should probably just make your tool respond to all of them.